Welding joint and chill ring therefor



Filed Feb. 24, 1939 Fig. 2.

Fig. 3.

INVENTOR BELA RONA) BY W ATTORNEY Patented Feb. 6, 1940 2,188,925

WELDING JOINT AND CHILL BIN THEREFOR Bela Ronay, Annapolis, Md.

Application February 24, 1939, Serial No. 258,266

Claims. (Cl. 113-112) (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) This invention relates to awelding joint and The combustible portions of the ring units may a chillring used in making such welded joint, be other substances besides thosementioned,

and has for an object to provide an improved such as wood flour, grainflour, or any other carchill ring usable in the preparation ofsuchweldbonaceous material in the finely divided form.

5 ing joint The role of the combustible material in the ma- A furtherobject of this invention is to provide trix of the rings is tovolatilize in course of welding an improved welded joint having theroots of the and thus leave the refractory residue as porous jointproperly fused together and having a subas a sponge. Without any binderthe porous restantially smooth interior surface which will not fractoryresidue is brittle and disintegrates under obstruct the flow of a fluidtherethrough. the slight blows given the weld metal in removing Afurther object of this invention is to provide slag subsequent to thedeposition of each pass a chill ring for use in making such weldedjoint, 01 layer of Weld metal into the groove of the which chill ring isof such a material that it will joint. Subsequently, this residue may beblown partly volatilize as the welding is carried on,leav out in solidchunks by air or washed out as a 1 ing a skeleton which is as porous asa sponge and thin sludge with water. brittle so that it will easilyshatter and may be The chill ring units I4 are each slightly tapered.blown or washed out. when used in a p p of t0 2 inches diameter Afurther object of this invention is to provide the chill ring units willbe each of an inch thick a chill ring for use in welding joint, whichchill and .006 of an inch difference in diameter be- 7 ring is madeinthe form of two separate portions, tween the upper and the lower facesthereof, 20

one portion being inserted at each end of the pipe thereby providingchill ring units which are forming part of the joint and whichchill ringtapered frusto-conical in shape. will fay with the end of the pipe sothat no In operation, a chill ring unit l4 will be placed icicles" willform on the interior of the joint. n the ends of each pipe to be joined,the taper A further object of this invention is to provide in the sidesof the unit being just suflicient to in- 25 a chill ring which isslightly tapered or frustosure proper faying of the chill ring withthemconical in outline so as to insure proper faying side of the pipeends so long as such pipe ends in a pipe which is within the limit oftolerance are within the limits of tolerance for the sizes inallowed forthe particular size involved. volved.

With the foregoing and other objects in view, Associated with the use ofthe rings is the de- 30 the invention consists in the construction, com-Sign pertaining to the preparation of the tube bination and arrangementof parts hereinafter ends. In order to obtain full penetrationwithdescribed and illustrated in the drawing, in out requiring unusualwelding technique, the dewhich, sign given forthwith must be adhered toin order Fig. 1 is a sectional view axially of a welded to develop thefull advantage of the use of the 35 joint utilizing the chill ring ofthis invention. subject chill rings.

Fig. 2 is a sectional view of a chill ring unit Since the primerequisite is to obtain full peneper d, tration, it is necessary toremelt a quantity of Fig. 3 is a bottom plan view of the chill ring basemetal at the root of the weld. If the joint 40 unit of Fig. 2. design isa U or a wide-bottom V, then the thick- 40 There is shown at 10 thelower end of an up ness of the squarely buttecl root face is the govperpipe which is secured to the upper end of a erning factor whether or notthe average welder lower pipe II by means of a weld l2 made acmayuniformly remelt it to its full depth. If cording to this invention. Oneunit I4 of the the depth of the root faces in joints of the abovechillring utilized in making the weld I2 is shown mentioned conventionaldesign is limited to 1 5", 45 in Figs. 2.and 3. This chill ring unit 14is made any welder of ordinary skill is able to remelt the of a mixtureof 15 alumina, or any other sultroot right from the start. However, ashe proable refractory, (-15% confectioners sugar, and ceeds the craterenlarges to an extent that it 10% graphite. All of these ingredients arein cannot be refilled in the normal rate of progrespowdered form andmixed thoroughly before besion, but requires special technique and eventhen 50 ing introduced into dies which shape the chill it is bound toproduce a slag pocket at the base ring units without the use of anyadditional bindof the so enlarged crater. On the other hand, ingmaterial. The proportions given may be if the root face is left heavierthan a for invaried within reasonable limits to increase or stance, thenthe melting through from the decrease the reiractoriuess, as may bedesired. start even for welders more skilled than the avcrage operator,becomes a diflicult'task, especially in position work.

In case of such design, the filling in of. the unavoidable cratersbecomes an even more serious obstacle. In order to permit the remeltingof the root without the ensuing complication of enlarged craters, thedesign shown on the drawing in Fig. 1 was evolved which enables thefulfillment of the above requirements. It consists of preparing one tubeend of each joint as onehalf of a conventional U joint having a rootface as at H. The other tube end of the joint is prepared with 30 kerfterminat ng in a 1 3" root face as at l8. In depositing the first passin the joint formed by abutting the above-mentioned tube ends, theelectrode, or theimpingement of the flame of a welding torch, isdirected against the heavier member. This permits the maintenance of aconstant crater size, as when a welder notes that the crater size issomewhat I larger than the diameter of the electrode he is using, heshifts his electrode further up on the sloping kerf of the 30 wall andthus, havingincreased the volume heated, he is able to controlconstantly and instantaneously the crater ing from the nature of theinvention, within the scope of what is hereinafter claimed.

The invention described herein may be manufactured and/or used by or forthe Government of, this invention, what is claimed is:

1. A hollow chill ring comprising a chill ring unit in the form of atruncated cone, said chill ring unit being insertable completely intothe end of the pipe being joined, said chill ring unit beingnon-metallic, said non-metallic chill ring unit consisting ofapproximately 45% alumina,

'- 45% confectioners sugar, and graphite.

2. A hollow chill ring comprising a chill ring unit in the form of atruncated cone, said chill ring unit being insertable completely intothe end of the pipe being joined, said chill ring unit beingnonmetal1ic, said chill ring unit consisting of a refractory and avolatizable material, said volatizable material comprising between 50and 60%.

3. A hollow non-metallic chill ring comprising a pair of chill ringunits, said units being adapted to be placed in the ends of the pipesbeing joined, said units being composed of a refractory comprising over40% and less than 60% and a volatizable material adapted to volatizeduring the welding and leave the refractory in a porous,brittlecondition adapted to disintegrate under slight shock.

4. A non-metallic chill ring unit consisting of approximately 45%alumina, 45% confectioners sugar and, 10% graphite.

5. In the method of preparing two pipe ends for welding into a singlejoint, the insertion of.

a frusto-conical chill ring section into each pipe end with its smallerdiameter interior of the pipe end and its greater diameter flush withthe pipe end, the smaller and greater diameters of the chill ringportion encompassing the limits of tolerance of the pipe diameter, thematerial of the chill ring section being semi-plastic to insure perfectfaying of the chill ring section to the pipe end, and then placing thetwo pipe ends into abutting relation with the flush ends of the chillring sections abutting to form a properly fayed complete chill ring.

BELA RONAY.

